Exploration of 3-roll Pilger Cold-rolling Pipe Mill

Analyzed here in the article are the problems as occurring during the manufacturing processes of the LG and LD pilger cold-rolling mills from such aspects as the structure design, the drive system and the pass design etc. Accordingly the design scheme of a new type 3-roll pilger cold-rolling mill that meets the higher rolling demand is proposed.Thanks to the employment of the straight reciprocating planet reducer by the said mill, all the main disadvantages of the conventional pipe-rolling mill are solved, including low transmission efficiency, long drive chain, high vibration, and large space as occupied by the equipment, etc. And due to adoption of the new 3-high rolling pass, the accuracy of the finished pipe is improved, and the requirements for rolling with large deformation and high precision are satisfied;further more the optimization of the structure of the mill as a whole gets the problems as staying with the conventional opening roll stand like low rigidity, load concentration, and long time-operation-caused metal fatigue deformation are all fixed.